|  On indicators of volume weight natural stones share on easy and heavy. маникюр easy stones in volume weight no more than 1800 РєРіРј3 have a porous structure (a volcanic tufa, pumice, limestone-shell rock) and consequently are applied mainly in the form of a piece stone and blocks to walls of buildings and rubble for easy concrete.
Heavy stones in volume weight more than 1800 РєРіРј3 a dense structure (from a granite, sienita, diorita, etc.) serve as facing v are used in the form of plates of a floor, materials and products for hydraulic engineering and road building. купить автошины
Durability. On strength at compression of samples in an air-dry condition natural stone materials divide into marks: 4, 7, 10, 15, 25, 35, 75, 100, 125, 150, 200, 300, 400, 500, 600, 800 and 1000. Marks with 4 to 200 are peculiar to easy stones of various porosity.
Frost resistance. пластическая хирургия on number of cycles of alternate freezing and the thawing, stood by samples in the conditions of standard test, natural stone materials divide into marks on frost resistance: РњСЂ10, Mrz15, Mrz35, Mrz100, Mrz150, Mrz200, Mrz300 and Mrz500. Dense stones with in regular intervals-granular structure have High frost resistance. Stones with a non-uniform porphyritic structure faster rastreskivajutsja at sharp changes of temperature owing to distinction of factors of temperature expansion melkokristallicheskoj weights and large vkraplennikov
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